Transcript
8M400
High Output Midrange Ferrite Transducer
Key Features 100,5 dB SPL 1W / 1m average sensitivity 51 mm (2 in) Interleaved Sandwich Voice coil (ISV) 250 Watt continuous pink noise power handling Improved heat dissipation via unique basket design Copper ring to linearize impedance curve
General Description 0220887410 8 Ohm
FERRITE LF-MB-MF TRANSDUCERS
The 8M400 is a high power, high output, 8” midrange for high level professional use. The excellent sound quality has been achieved as a result of extensive research on mid frequencies intelligibility. The 8M400 has been designed for use as a midrange in both horn and direct radiation, closer or reflex enclosures, as small as 3 lt. The curvilinear cone, made with a high damping wood pulp, has been designed to achieve the best possible linearity within its frequency range. The in-house developed cone treatment is a humidity repellent and also dampens the bell mode resonance significantly. The 51 mm (2”) voice coil assembly is wound on a strong fiberglas former to improve force transmission and power handling. The powerful magnet assembly assures high flux concentration. The force factor and power handling are at an optimum level. The direct contact between the finned basket and the magnetic structure significantly improves thermal connection and heat dissipation, further increasing power handling and lowering power compression. The copper shorting ring on the pole piece reduces inductance and improves transient response and phase control in the mid frequencies.
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FERRITE LF-MB-MF TRANSDUCERS
8M400
High Output Midrange Ferrite Transducer
NOMINAL DIAMETER RATED IMPEDANCE CONTINUOUS PINK NOISE (1) CONTINUOUS POWER (2) PROGRAM POWER (3) PEAK POWER (4) SENSITIVITY (5) FREQUENCY RANGE (6) POWER COMPRESSION @-10DB (7)
200 mm (8 in) 8 Ohm 250 W 160 W 320 W 650 W 100,5 dB 120 ÷ 6100 Hz (16 W) 0,5 dB
POWER COMPRESSION @-3DB POWER COMPRESSION @FULL POWER
(80 W) 1,6 dB (160 W) 2,7 dB
MAX RECOMM. FREQUENCY RECOMM. ENCLOSURE VOLUME MINIMUM IMPEDANCE MAX PEAK TO PEAK EXCURSION VOICE COIL DIAMETER VOICE COIL WINDING MATERIAL POLARITY
4000 Hz 2 ÷ 10 lt. (0,07 ÷ 0,35 cuft) 6,5 Ohm at 25°C 13 mm (0,51 in) 51 mm (2,00 in) aluminum positive voltage on red terminal gives forward cone motion
FREQUENCY RESPONSE CURVE OF 8M400 MADE ON 3 LIT. CLOSED ENCLOSURE IN FREEFIELD (4PI). ENCLOSURE CLOSES THE REAR OF THE DRIVER. THE THIN LINE REPRESENTS 45 DEG. OFF AXIS FREQUENCY RESPONSE
FREE AIR IMPEDANCE MAGNITUDE CURVE
THIELE SMALL PARAMETERS (8) Fs Re Sd Qms Qes Qts Vas Mms BL Linear Mathematical Xmax (9) Le (1kHz) Ref. Efficiency 1W@1m (half space)
90 Hz 5,2 Ohm 0,0227 sq.mt. (35,19 sq.in.) 6,2 0,28 0,27 16,2 lt. (0,57 cuft) 14 gr. (0,03 lb) 12,2 Tm ± 3 mm (±0,12 in) 0,95 mH 98,1 dB
MOUNTING INFORMATIONS Overall diameter N. of mounting holes Mounting holes diameter Bolt circle diameter Front mount baffle cutout ø Rear mount baffle cutout ø Total depth Flange and gasket thickness Net weight Shipping weight CardBoard Packaging dimensions
210 mm (8,27 in) 6 6 mm (0,23 in) 195 - 198 mm (7,68 - 7,80 in) 186 mm (7,32 in) 184 mm (7,24 in) 105,5 mm (4,15 in) 14,5 mm (0,57 in) 4,5 kg (9,93 lb) 4,8 kg (10,6 lb) 235 x 235 x 150 mm (9,25 x 9,25 x 5,91 in)
NOTES (1) AES standard (2) Continuous power rating is measured in 3 lit closed enclosure using a 100 - 2500Hz band limited pink noise test signal applied continuously for 2 hours. (3) Program power rating is measured as for 2 above but 50% duty cycle. (4) The peak power rating is based on a 6dB crest factor above the continuous power rating and represents the maximum permitted instantaneous peak power level over a maximum period of 10ms which will be withstood by the loudspeaker without damage. (5) Sensitivity represents the averaged value of acoustic output as measured on the forward central axis of cone, at distance 1m from the baffle panel, when connected to 2,83V sine wave test signal swept between 500Hz and 2500Hz with the test specimen mounted in the same enclosure as given for 2 above. (6) Frequency range is given as the band of frequencies delineated by the lower and upper limits where the output level drops by 10 dB below the rated sensitivity in half space environment. (7) Power compression represents the loss of sensitivity for the specified power, measured from 100-1000 Hz, after a 5 min pink noise preconditioning test at the specified power. (8) Thiele - Small parameters are measured after the test specimen has been conditioned by 250 W AES power and represent the expected long term parameters after a short period of use. (9) Linear Mat. Xmax is calculated as; (Hvc-Hg)/2 + Hg/4 where Hvc is the coil depth and Hg is the gap depth.
EIGHTEEN SOUND - Via dell'Industria 20 - 42025 Cavriago Italy - Tel. +39 0522 494402 - Fax +39 0522 494410
Eighteen Sound engages in research and product improvement. New materials and design refinements can be introduced into existing products without notice.
GENERAL SPECIFICATIONS
